These are a sub-type of traditional digital pianos that offers a more classical design which closely resemble an acoustic upright piano. Upright digital pianos are mainly intended for home use, and is usually more expensive than the other types. Some models, especially the higher-end ones, often feature an actual wooden keys as opposed to regular plastic keybed.
All in all, what matters above all is your own style. Whether you choose to emulate a famous bassist with a signature model or forge your own path with something that caters to your personal tastes, it's all good. There's no shortage of bass guitars for sale, just like there's no limit on what you can do to make your new instrument all your own once you have it in your hands.
Since there are so many digital pianos worthy of your attention in this catalog, you may want to narrow down your choices using some of the search options on the sidebar. For example, if you select stage digital pianos under the category section, you'll be presented with all the digital pianos that were made for the stage. Once here you have the opportunity to drill down even further and can search by topics like number of keys, MIDI/USB Connections or by whether or not the digital piano has built-in speakers.